You are right - it is a moral judgement each woman has to make. But it is also a judgement about survival - hers and her child's. Sometimes, sadly, a woman knows she just can't go through with this pregnancy/birth/childrearing - for multitudes of reasons.
Yes, we have to weigh it all up. Over and over again, before we actually go ahead with our decisions.
It's not something I would wish on anyone. But many of us have had to make this decision - one way or another - and then we have to live with it for all eternity. And we do. Peacefully or with angst.